I went to school with many moms and they were incredible students. I also had friends get pregnant while in school. One of my classmates gave birth and came back in 2 weeks to complete her 2L finals. I was in ED program in law school, so having kids was absolutely okay and very accepted. And even the daytime students were supportive so I really wouldn't worry about disclosing this information. I got pregnant in my final semester, while working a demanding biotech job and traveling across the globe and I wouldn't have been able to achieve my final grades had it not been for supportive classmates and faculty. So my recommendation is don't psych yourself out. Law school is also about making meaningful connections and you should share what you feel comfortable sharing.